scripts/utils.py

# Copyright (c) MONAI Consortium
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#     http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and

import monai
import torch


def compute_scale_factor(autoencoder, train_loader, device):
    with torch.no_grad():
        check_data = monai.utils.first(train_loader)
        z = autoencoder.encode_stage_2_inputs(check_data["image"].to(device))
    scale_factor = 1 / torch.std(z)
    return scale_factor.item()